Beneath its purple pall , the face painted on the canvas could grow bestial , sodden, and unclean.在这块紫色的棺衣下, 画布上的脸变得毫无人性、污秽 、 不洁.The unrest has cast a pall over what is usually a day of national rejoicing...动荡的局势给往常举国欢庆的...
Semiconductors containing such impurities are called p - type semiconductors.含有这类杂质的半导体叫做P型半导体.It is not possible to name any particular conductivity at which metals end and semiconductors begin.不可能说出在哪个特定的导电系数处是金属和半导体的分...